Taxonomy:
Distinguishing features: Medium sized; broadly elliptical to sib-circular; central area broad, spanned by a plate with perforations too small to resolve in LM.
Farinacci & Howe catalog pages: T. patellus *
Morphology: Medium sized, broadly elliptical to subcircular Toweius with relatively wide central area (width similar to or slightly greater than the rim) spanned by weakly birefringent plate; no obvious perforations are apparent in LM. [Bown 2016]
Distinguished from other Toweius species by the relatively wide central area spanned by a plate with no clearly visible perforations in LM. [Bown 2016]
Tags | LITHS: placolith, elliptical, CA: ca_conjunct, grill, vacant, CSPH: equant, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent, |
Metrics | Lith size: 5->8µm; |
Geological Range:
Last occurrence (top): within NP11 zone (53.70-54.17Ma, top in Ypresian stage). Data source: Bown 2016
First occurrence (base): within Np5 zone (59.54-61.51Ma, base in Selandian stage). Data source: Bown 2016
Plot of occurrence data:
Bown, P. R. & Newsam, C. (2017). Calcareous nannofossils from the Eocene North Atlantic Ocean (IODP Expedition 342 Sites U1403–1411). Journal of Nannoplankton Research. 37(1): 25-60. gs V O Bown, P. R. (2016). Paleocene calcareous nannofossils from Tanzania (TDP sites 19, 27 and 38). Journal of Nannoplankton Research. 36(1): 1-32. gs V OReferences:
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Toweius patellus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-2-2021
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